Condensed Financial Information (Parent Company) (Long-term Debt - Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 101	$ 108
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	1,300
Long-term Debt, Maturities, Repayments of Principal in Year Two	162
Long-term Debt, Maturities, Repayments of Principal in Year Three	52
Long-term Debt, Maturities, Repayments of Principal in Year Four	349
Long-term Debt, Maturities, Repayments of Principal in Year Five	457
Long-term Debt, Maturities, Repayments of Principal after Year Five	12,800
Parent Company
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	1,200
Long-term Debt, Maturities, Repayments of Principal in Year Two	427
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	213
Long-term Debt, Maturities, Repayments of Principal in Year Five	625
Long-term Debt, Maturities, Repayments of Principal after Year Five	13,400
Senior Notes	14,431	14,516
Parent Company | Senior Notes Unaffiliated [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	99	106
Senior Notes	14,431	14,516
Parent Company | Senior Notes, Affiliated [Member]
Condensed Financial Statements, Captions [Line Items]
Senior Notes	$ 1,447	$ 1,585